Last night, in an attempt to modify what I hear as a slight upper midrange/lower treble "hump," I swapped the Ori's lambskin pads (Zach's preference for "smoother sound") w/the cowhide pads, which are ~1/4-1/2" thicker on the back side of the pads + somewhat more dense. The results are pretty interesting...
There are comments in reviews of the Omni/Ori (& in this thread) to the effect that cowhide pads slightly reduce treble and increase bass. I'm not finding that to be exactly true. IMO the effect is more subtle:
- Not only is that treble "hump" diminished, but the entire frequency range, top to bottom, seems flatter
- The bass, if anything, is slightly shelved down now (particularly the mid-bass). But since the mid-bass was slightly shelved up to begin with, the result sounds very good.
- The Ori's spacious soundstaging is now slightly more spacious & reverberant--but not in an annoying way. It's pretty fine sound-staging for a 95% closed back design...
w/cowhide pads, the Ori seems to do the "technicalities" better than before. Overall it's a little less exciting, but a bit more accurate. Fascinating that a simple pad swap would tweak the sound like this.
NOTE: I only confirmed that I was hearing a treble "hump" in my Ori after comparing it to the Eikon--a very interesting contrast. The Eikon is the flattest headphone I've ever heard, no significant spikes/dips anywhere. And yet it's slightly warm, euphonic, and exciting/dynamic (this is great tuning). To my ears, the Ori sounds somewhat different than the Eikon, with somewhat richer/more "plush" bass (planar bass), and not as much sub-bass; a little more soundstage "space" & reverberation (a relatively subtle difference)--and upper midrange/llower treble that's slightly bumped up & not quite as smooth as the Eikon.